Introduction
If selecting an external medical power adapter feels limiting, an internal solution may be a better fit.
Open-frame power supplies are widely used in medical and industrial equipment where space, thermal performance, and customization matter more than enclosure convenience.
But while they look simpler, they actually require more careful design consideration.
What Is an Open-Frame Power Supply?
An open-frame power supply is a power module without an enclosed casing.
It typically consists of a PCB and electronic components, designed to be installed inside a device or integrated into a protected system.
Because there is no outer shell, it offers better airflow, a smaller size, and greater flexibility compared to traditional enclosed AC-DC power adapters.
Why Use Open-Frame Power Supplies in Medical Devices
Thermal Performance
Open-frame designs allow direct airflow across components.
This improves heat dissipation significantly, especially in high-load or continuous-operation devices such as infusion pumps and oxygen concentrators.
With proper airflow or fan support, these systems can maintain stable operation under demanding conditions.
Compact Integration
Without a metal enclosure, open-frame units are smaller and easier to embed into device structures.
This is critical for compact medical equipment where internal space is limited.
Engineers can integrate the power module directly into the system layout, reducing assembly complexity and saving cost.
Design Flexibility
Unlike enclosed adapters, open-frame designs allow engineers to adjust circuits more easily.
Voltage ranges, protection circuits, and component selection can be modified to meet specific requirements.
This flexibility is especially useful when adapting products for different markets or standards.
Faster Certification Adaptation
For medical devices requiring the IEC 60601-1 medical electrical safety standard, open-frame designs offer a major advantage.
Instead of redesigning the entire system, engineers can adjust parameters or layout within the power module.
This reduces certification time and simplifies product iteration.
How to Choose the Right Open-Frame Power Supply
Power Margin and Load Behavior
Always consider the startup current and peak demand, not just rated power.
Insufficient margin can lead to voltage drops, overheating, or unstable operation over time.
Thermal Design and Airflow
Although open-frame power supplies dissipate heat well, they depend heavily on system-level airflow.
Plan fan placement, airflow direction, and heat paths carefully to avoid hotspots inside the device.
Safety and Compliance
Choose models that meet IEC 60601-1, UL, and CE requirements.
Because the board is exposed, proper creepage distance, grounding, and shielding are critical to prevent electrical hazards.
Environmental Protection
Open structures are more sensitive to dust and humidity.
For long-term reliability, consider conformal coating or modular designs that allow easy maintenance and replacement.
From Open Design to Reliable Power Solutions
Open-frame power supplies offer more than compact size—they provide flexibility for engineers to optimize performance, layout, and compliance.
At Quankang, our medical power supply solutions are designed with strict safety margins and support customization for different medical applications.
If you are developing compact or high-reliability medical equipment, you can explore our open-frame solutions or contact us to find a suitable configuration for your system.
Conclusion
Open-frame power supplies are ideal for applications that require compact integration, efficient thermal management, and flexible design.
However, “open” does not mean simple.
Proper thermal planning, insulation design, and compliance with medical standards are essential to ensure safe and stable operation.
Choosing the right medical power supply means selecting not just a component, but a complete solution that supports performance, safety, and long-term reliability.
